66599372880 has 200 divisors, whose sum is σ = 232698356352. Its totient is φ = 17653199616.

The previous prime is 66599372821. The next prime is 66599372891. The reversal of 66599372880 is 8827399566.

66599372880 is a `hidden beast` number, since 6 + 6 + 599 + 37 + 2 + 8 + 8 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1051389 + ... + 1112931.

Almost surely, 2^66599372880 is an apocalyptic number.

66599372880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66599372880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116349178176).

66599372880 is an abundant number, since it is smaller than the sum of its proper divisors (166098983472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66599372880 is a wasteful number, since it uses less digits than its factorization.

66599372880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61735 (or 61720 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 66599372880 in words is "sixty-six billion, five hundred ninety-nine million, three hundred seventy-two thousand, eight hundred eighty".